Buggy code:
public class Claim { private static DateFormat dateFormat = new SimpleDateFormat ( "MM//dd//yyyy" , Locale . US ) ; private User Claimant ; private User approver ; private String comment ; private int id ; private String name ; private Date startDate ; private Date endDate ; private String Description ; private String Status ; private ArrayList < Destination > destinations ; private ArrayList < ExpenseItem > expenseItems ; private ArrayList < String > tagList ; private ArrayList < Listener > listeners ; public Claim ( String name , Date startDate , Date endDate , String description , User Claimant , int id ) { } public void returnClaim ( String name ) { } public void approveClaim ( String name ) { } public boolean editable ( ) { } public boolean incomplete ( ) { } public String toStringApproverList ( ) { String ds = Claim . dateFormat . format ( startDate ) ; String block = ( ( ( ( "[" + ds ) + "]<seq2seq4repair_space>" ) + ( Claimant . getUserName ( ) ) ) + "<seq2seq4repair_space>-<seq2seq4repair_space>" ) + ( Status ) ; if ( ! ( ( getTotal ( ) . size ( ) ) == 0 ) ) { block += "\n" + ( toStringList ( getTotal ( ) ) ) ; } if ( ! ( ( destinations . size ( ) ) == 0 ) ) { block += "\n" + ( destinationsToString ( ) ) ; } <START_BUG> if ( ! ( ( approver . getUserName ( ) ) == null ) ) { <END_BUG> block += "\n" + ( approver . getUserName ( ) ) ; } return block ; } public String toStringClaimantList ( ) { } public String destinationsToString ( ) { } public String toStringList ( ArrayList < String > list ) { } public String toEmail ( ) { } public boolean equals ( Claim claim ) { } public void removeItem ( int i ) { } public void addItem ( ExpenseItem Item ) throws AlreadyExistsException { } public boolean containsItem ( ExpenseItem Item ) { } public void addDestination ( Destination destination ) throws AlreadyExistsException { } public void removeDestination ( int i ) { } public boolean containsDestination ( Destination Destination ) { } public void removeTag ( int pos ) { } public void addTag ( String tag ) throws AlreadyExistsException { } public boolean containsTag ( String tag ) { } public int getId ( ) { } public ArrayList < ExpenseItem > getExpenseItems ( ) { } public void setExpenseItems ( ArrayList < ExpenseItem > expenseItems ) { } public String getName ( ) { } public void setName ( String name ) { } public User getClaimant ( ) { } public void setClaimant ( User name ) { } public String getComment ( ) { } public void setComment ( String comment ) { } public String getDescription ( ) { } public void setDescription ( String desc ) { } public String getStatus ( ) { } public void setStatus ( String status ) { } public Date getStartDate ( ) { } public void setStartDate ( Date startDate ) { } public Date getEndDate ( ) { } public void setEndDate ( Date endDate ) { } public ArrayList < Destination > getDestination ( ) { } public void setDestination ( ArrayList < Destination > destination ) { } public User getApprover ( ) { } public void setApprover ( User app ) { } public ArrayList < String > getTagList ( ) { } public ArrayList < String > getTotal ( ) { } private ArrayList < Listener > getListeners ( ) { } private void notifyListeners ( ) { } public void addListener ( Listener L ) { } public void removeListener ( Listener l ) { } }

Fix:
if ( ! ( ( approver ) == null ) ) {